[TYPO3-core] FYI: removing the page tree filter toggle

[Dmitry Dulepov [typo3]]

Hi!

Ingo Renner wrote:
> here's how it looks

What does the icon before input do? Normally icon goes after and means "click me to search". Icon before is used when it opens pop up options or something else.

-- 
Dmitry Dulepov
TYPO3 core team
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